A Bimodal Loading Test for Engine and General Purpose Air Cleaning Filters

970674

02/24/1997

Event
SAE International Congress and Exposition
Authors Abstract
Content
The dust holding capacity of air cleaning filter depends on the size distribution of the particles. Traditional test dusts like Arizona road dust consist of a single mode of coarse particles. The purpose of this study is to evaluate the dust holding capacities of air filters with a bi-modal test dust that simulates the dust in atmospheric environments. The fine mode of the test dust consists of submicron Alumina particles that represent the fine particles in atmosphere. The coarse mode consists of traditional AC fine dust. The fine and coarse dusts are mixed in different mass ratios to simulate different atmospheric conditions. The ratios are 100% fine, 50%/50%, 25%/75%, 10%/90%, and 100% coarse. An engine air filter and a HVAC filter were studied with the bi-modal test dusts. The filter pressure drops were measured as a function of the dust loading. The results show that the flow resistance rises significantly faster as the ratio of fine to coarse fraction increases. It is estimated that using traditional test dust would overestimate the dust holding capacities of filters used in typical urban and freeway environments by three to four times.
Meta TagsDetails
DOI
https://doi.org/10.4271/970674
Pages
6
Citation
Poon, W., and Liu, B., "A Bimodal Loading Test for Engine and General Purpose Air Cleaning Filters," SAE Technical Paper 970674, 1997, https://doi.org/10.4271/970674.
Additional Details
Publisher
Published
Feb 24, 1997
Product Code
970674
Content Type
Technical Paper
Language
English